Abstract
An experimental investigation of the flowfield inside a high hub-to-tip ratio, single-stage compressor is described. Fast-response instrumentation was used for the measurements in the absolute and relative frames of reference. The information was digitized for further analysis of the instantaneous and averaged flow parameters. The calculation of power spectra and the autocorrelation function, and the phase-locked averaging technique are used in this study. This technique consists of dividing the long sample in time intervals equal to the period as obtained by fast Fourier transforms and ensemble averaging these intervals. This procedure has been adopted because it can handle singleand multicell patterns. Two types of perturbation are distinguished: the small eight-cell stall and the singleor double-cell pattern with deep stall. The overall flow behavior, as well as the detailed flowfield structure, are presented for the two cases as measured with stationary probes. On-blade flow measurements suggest the existence of important radial velocities near the rotor blade surface when deep stall occurs.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call